Apparatus for grinding corrugated rolls and bedplates



April 2, 1929. JONES 1,707,555

APPARATUS FOR GRINDING CORRUGATED ROLLS AND BEDPLATES Filed March 23,1926 Patented Apr. I 2, 1929.

; z I UNITED. "STATES PATENT OFFICE. I

ROBERT B. JONES,'0F BARBIE, VERMONT, AssIeno 'ro JONES BROTHERS COMPANY,

OF BOSTON, MASSACHUSETTS, A CORPORATION OF MAINE.

APPARATUS FOR GRINDING ooRRUG TE-D ROLLSAND REDrLATEs.

Applicatioirfi led mar'ciiaa eze. Serial No. ,895. I

This invention relates to a method and ap paratus for grinding twocorrugated surfaces to form" mutually interfitting complementalengagement with each other. 1

' I11 the grinding of soft or yieldingmaterials, the dimensions ofclearance or free path between opposed grinding. surfaces is substantially. the determinative-factor in the degree of disruptionandicomminution to which the material may be reduced in a given apeparatus. In. devicesintended for handling this type of materialthecontinued movement of the material over or between the grinding surfacesis directly dependent upon the frictional rubbing and sliding actiontherebetween. However, such surfaces will not continue to grind orcomminute such substances if separated a sufficient distance'topermitthe free flow of the material between them.

- In, the art of' grinding and pulverizing chocolate, for example, itis'comrnon practice to employ a stone bed-plate, which may beplate,+,the chocolate .being. caught, crushed and ground between thetwosurfaces by the.

: .relative rolling orsliding movement of the rolli; For this purpose,itis obviously -desir-- able that theopposed surfaces shall'present asgreat an area as practicable.

y it is usual .to provide corrugations upon'the roll which preferablystand perpendicular .to the axisjand which are adapted to. fit intocorresponding longitudinal corrugations 'or' grooves provided upon thebed-plate; This arrangement introduces an additionally effectivemalaxatingactionupon thechocolate .as successive portionsof thecorrugatons on the wheel enter and leave the oorrugationson the bed plateiHowever, it will be clear that if irregular projections occur upon-,either c a HHLChlIIB parts being broken away to-"show;

the. n 'dclle roll, as mounted forfuse'inpulsurface, they will begradually removed by the rolling action 'and thus contaminate the will.cease? to function in such spots:

Hence, it is an object ofthe present irivenf :tion to provide a methodand apparatus for making a corrugated bed-plate and onehor morecorrugated rolls corresponding thereto To this end which shall mutuallyinterlit to form comple mental engagement therebetween and substantiallyexactly coincide throughout their relative paths of'traverse movementwhen employed in the subsequent grinding or milling'operations for,which they .are intended. Other objects will appear from the followingdisclosure. r r In general, the method of the'lnvention comprises theprelllninary'fashlonlng of'a flat stone bed-plate andone or more rollsfrom stone of substantially the same degree of hardness and cuttingparallel longitudiplate, both sets of'corrugations loosely intervfitting or meshing with each other. v The rolls andbed'-pla'te are thensubjected to relative longitudinal reciprocatory' movement [throughoutthe. length of the' c o'rrugations uponthe: bed plate, 1 The roll orrolls are'held in constant but" light contact With the bedplate.. Thispath or traverse is preferably equal to, or greater than thatsubsequently involved in the relative traverse movement to be employedinthe pulverizing operations. Preferably the paths traversed by'adjacent rolls (running I V in tandem) upon the bed-plate-will overlap.

machine; and

veri zing operations;

' Referrin to Fi 1 the rindin machine h 3") 7 Z l ZJ includes a truck 1fwhich. is mounted to run uponla' pair of rails2 and adaptedto'carry.tlie bed-plates in 'a horizontal position;

Therails2'are fixed to sleepers and heavy wooden floor beams 4 whichextend laterally nal corrugations in the surface of the'bed- Theapparatusof the invention will be d'efscribed from'theaillustration of apreferred embodiment shown in the accompanying 'drawings,in which f I iFig. 1 is aside elevation ofthe grinding Fig. 2 is an end elevation ofthe grinding;

ofthe rails and serve to receive'brackefts 5.

tially exactly.

Beams 6, parallel to the floor beams 1 and fixed at a suitable heightthereabove to allow sufficient clearance, are also fitted with brackets7. Ways or guides 8 are positioned and firmly held in vertical positionbetween the brackets 5 and brackets 7 respectively, on either side ofthe track 2. Beams 6 are held in spaced relationship by reinforcing rods9.

The roll carrier 10 is suspended between the vertical uprights 8 bymeans of straps 11, 11 attached thereto on either side and to a crossbar at the top. The carrier may be raised and lowered by any suitablemeans as for example by the means shown in my prior Patent No. 1,290,224dated January 7, 1919. Since the particular means to be employed formsno part of the present invention, it'is not set forth in the drawings.At the corners of the carrier 10 sleeves 12 are provided which slidablyreceive the vertical uprights 8 passing therethrough and restrain thecarrier to an accurate up and down movement only.

Angle irons 13, 13 by which the sleeves 12 are carried supportupstanding plates 14, 14' upon which is mounted in suitable bearings ahorizontal axis 16 having loose and driving pulleys 17 and atone end, agear wheel 18. The gear wheel 18 meshes with an intermediate gear wheel19 mounted in the plate 14:.

In horizontal alignment upon angle iron 18, there are provided threeintermeshing gears 21, 22, 23 turning upon axles 21, 22, 23, mounted insuitable bearings thereon each axle having a concentric hub at its innerend. Corresponding bearings, axles and hubs are supported on the angleiron 13. Cylindrical stone rolls to be ground are now mounted by anysuitablemeans of engagement upon the hubs between the pairs of opposedbearings thus arranged. In Fig. 2 is shown a hub 22 on the axle 22 and acooperating hub 25 between which hubs is supported a roll 27. Thebedplate 3 and rolls 27 are provided with suitably spaced corrugations, asstated above, by cutting or by other suitable means. Such corrugationsare substantially. correct but in order that the rolls and bed platefunction properly, they must mutually interfit and coincide substan-This finished condition is preferably attained in the followingmanner.

The bed-plate 3 is horizontally positioned,

upon the truck 1 with the corrugations thereon'parallel to the railsupon which the truck is mounted, andtlien further adjusted laterally sothat the corrugations of the bedplate stand directly underthecorrugations upon the rolls and in interfitting relationshiptherewith.

A fluid grinding mixture (usually of water emulsion and pulverizedgranular abrasive) is spread over the surface of the bedplate. Thecarrier is then lowered until the rolls come into contact with thebed-plate, preferably with light pressure contact at the start. Thedriving pulley 17 is then coinnected (asby a'belt, not shown) to asuitable source of power whereupon the gear 18 is revolved and drivesthough more slowly, the intermediate gear 19 which in turn acts directlyupon the gear 22. For a given direction of rotation of gear 22, asindicated by the arrow, the gears 21 and 28 which are meshed therewithare both driven in the direction opposite to that of the gear 22.

Accordingly, the rolls 2'? are rotatably driven in a correspondingmanner against the opposed surface of the bed plate 3 lying thereunder.i

The initial grinding action between the two corrugated surfaces, asalready noted, must usually be done with light contact unless in thepreliminary preparation of the stones substantially exact registryhas-been effected, which is not usually the case and ordinarily notcommercially feasible. If this precaution is not observed, chipping mayoccur and local overheating is almost certain to result. By maintaininglightlpressure contact, however,tl1ese difficulties may be eifectivelyavoided. I 7

After proper adjustment of the rotating rolls and of the bed-plate hasbeen satisfactorily accomplished the bed-plateis slowly advancedlongitudinally by pushing the truck upon which it is carried along therails 2. 'This movement also should jbe initiated slowly and withoutappreciable pressure un- 100 til after a few passes have been completed,extending throughout the desired length oftraverse. l i c Thegrinding'actionthus set. up 'is continued, until the corrugatedsurfaoesof the 5 roll or rolls and of the bed-plateare substantiallycomplemental eachto each throughout their, entire lengths andare-provided with finished surfaceswhich are sufliciently smooth.

When a plurality of corrugated rolls are being ground to fit, a singlebedsplate each traverse of each roll with respect to-thebedplate, shouldoverlap that of the roll or'rolls ahead or behind'it r The totaltraverse of the rolls may stop shortof the ends of the bed-plate, or mayextend throughout its entire length. When the full length ofthebed-plate is thus ground two or more may be assembled end to end-. inabutted relationship in the construction" of them for the pulverizingoperations. Ordina'rily it is preferable not to construct a mill in'whichfthe rolls pass over a jointed seam, since the corners, though incloseabutment. and firmly joined are subjected} to cracking orsplittingunder compression.

It is clear that various modifications and. adaptations of the'inventionmay be made in actual practice, without departing from-thefications andadaptations are'to bG-COIlSlClGI'QCl' as comprehended by thepresent'spccification and included by the following claims.

I claim: p

1. A machine for finishing the contour of annular corrugations in aseries of rolls and of longitudinal corrugations in a bed-plate so thatthe corrugations of the rolls and of the bed plate will mutuallyinterfitand substantially coincide comprising a longitudinally movablesupport for the bed-plate and a carrier for the rolls, intermeshinggears mounted at the ends of the rolls and means on said carrier .forrotating the rolls inde-' pendently of the plate whereby as the platesupport is vcaused to reciprocate longitudr' annular corrugations in aseries of rolls and of longltudmal corrugations in a bed-plate so thatthe corrugations of the rolls and of I i 2. A machine for finishing thecontour of the bed plate will mutually interfit and substantiallycoincide comprising a longitudinally movable support for thebed-plateand a carrier for the rolls, intermeshing gears mounted at theends of the rolls and means on said carrier for rotating the rollsindep'endently of the plate, each roll being driven in adirectionopposite to that of an adjacent roll whereby as the plate support iscaused to reciprocate longitudinally the corrugations of each roll willfollow'the corrugations of the adjacent roll while being rotated in pthe opposite direction and coact turn withthe corrugations of thebed-plate.

Signed by me at Barre, Vermont,'this 17 th day of March, 1926. I

, ROBERT JONES.

